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You can't gauge the individual course you will take based on the national reputation of the company. The tutors get hired and teach with little or no training, and most teachers work simultaneously for multiple companies. The unique thing to each company is the materials, but they are worthless.

The only thing that matters is the particular tutor/teacher that you get, and strong and poor teachers work at every company.

Get in touch with any company in your area and see how you like the person they assign. Most places will let you cancel after the first meeting in both classes and tutoring, take advantage of this if things don't seem right.